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Add a tuneable to allow disabling msi on drm at runtime.

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Suggested by:	jhb@

MFC after:	2 weeks
This commit is contained in:
Robert Noland 2009-02-27 23:50:55 +00:00
parent 8363eacca1
commit 45de2347c4
1 changed files with 5 additions and 1 deletions
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6
sys/dev/drm/drm_drv.c
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@ -134,6 +134,9 @@ static struct cdevsw drm_cdevsw = {
.d_flags = D_TRACKCLOSE
};
int drm_msi = 1; /* Enable by default. */
TUNABLE_INT("hw.drm.msi", &drm_msi);
static struct drm_msi_blacklist_entry drm_msi_blacklist[] = {
{0x8086, 0x2772}, /* Intel i945G */ \
{0x8086, 0x27A2}, /* Intel i945GM */ \
@ -222,7 +225,8 @@ int drm_attach(device_t nbdev, drm_pci_id_list_t *idlist)
dev->pci_vendor = pci_get_vendor(dev->device);
dev->pci_device = pci_get_device(dev->device);
if (!drm_msi_is_blacklisted(dev->pci_vendor, dev->pci_device)) {
if (drm_msi &&
!drm_msi_is_blacklisted(dev->pci_vendor, dev->pci_device)) {
msicount = pci_msi_count(dev->device);
DRM_DEBUG("MSI count = %d\n", msicount);
if (msicount > 1)